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authorWei Wang <weiwan@google.com>2018-09-18 13:45:00 -0700
committerDavid S. Miller <davem@davemloft.net>2018-09-18 20:17:01 -0700
commitce7ea4af0838ffd4667ecad4eb5eec7a25342f1e (patch)
tree196f9e53a53e7aa2c52573c446400640d54f35ad /net
parent8675860592321a43bbb0b5aedc244a9b2321edc3 (diff)
downloadlinux-ce7ea4af0838ffd4667ecad4eb5eec7a25342f1e.tar.bz2
ipv6: fix memory leak on dst->_metrics
When dst->_metrics and f6i->fib6_metrics share the same memory, both take reference count on the dst_metrics structure. However, when dst is destroyed, ip6_dst_destroy() only invokes dst_destroy_metrics_generic() which does not take care of READONLY metrics and does not release refcnt. This causes memory leak. Similar to ipv4 logic, the fix is to properly release refcnt and free the memory space pointed by dst->_metrics if refcnt becomes 0. Fixes: 93531c674315 ("net/ipv6: separate handling of FIB entries from dst based routes") Reported-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/route.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b5d3e6b294ab..826b14de7dbb 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -364,11 +364,14 @@ EXPORT_SYMBOL(ip6_dst_alloc);
static void ip6_dst_destroy(struct dst_entry *dst)
{
+ struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
struct rt6_info *rt = (struct rt6_info *)dst;
struct fib6_info *from;
struct inet6_dev *idev;
- dst_destroy_metrics_generic(dst);
+ if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
+ kfree(p);
+
rt6_uncached_list_del(rt);
idev = rt->rt6i_idev;